Reamer for earth-boring buckets



1934. F. A. SCHROEDER Re. 19,281

REAMER FOR EARTH BORING BUCKETS 2 Sheets-Sheet 1 Original Filed March24, 1932 8 \2 i 1 x 1- n L w. m o v1 :IILLLIIHHI is z /%w I ATTORNEY1934- F. A. S CHROEDER Re. 19,281

REAMER FOR EARTH BORING BUCKETS Original Filed March 24. 1932 2Sheets-Sheet 2 55 i M 14" 56 W "H H" M Wu I FIG].

Reissued Aug. 21, 1934 UNIT ED STATES PATENT. OFFICE 19,281 REAMER FOREARTH-BORING BUCKETS Original No. 1,916,691, dated July 4, 1933, SerialNo. 600,840, March 24, 1932.

Application for reissue June 13, 1934, Serial No. 730,528

17 Claims.

This invention pertains to a rotary earth boring bucket, with specialreference to an adjustable reamer mounted on the bucket, by means of Hwhich the hole bored by the bucket may be enlarged or reamed to apredetermined diameter.

An object of the present invention is to disclose improved apparatus foradjusting the operative diameters of earth boring tools such as rotarybuckets, scarifiers, etc.

Another object is to provide means for adjusting the operative diameterof a tool before said tool is in operative position in the hole in theground together with means for automatically r expanding said tool tothe operative diameter while the tool is in operative position in thehole in the ground.

I Another object of the present invention is to disclose a reamer simplein design, cheap to manufacture, and with little likelihood to get outof order and service.

Further and other objects and advantages will be apparent from thespecification and. claims, and from the accompanying drawings whichillustrate what is now considered the preferred embodiment of theinvention.

Fig. 1 is a vertical cross-section through the center of the'bucket, online l-l of Fig. 2 showing reamer retracted. I

Fig. 2 is a cross-section on line 2-2 of Fig. 1.

413. Fig. 3 is a view similar to Fig. 2 but with reamer blades inoperative positions.

Fig. 4 is a fragmentary view on line 4-4 of Fig. 3.

Fig. 5 is a fragmentary view on line 5-5 of :83 Fig. 2.

Fig. 6 is a fragmentary view on line 6-6 of Fig. 2;

Fig'. '7 is a fragmentary view on line 7-7 of Fig. 3.

Referring to the drawings, the rotary bucket comprises a shell'lO,discharge gates 12, and bails '14,'the downwardly projecting arms of thebails being attached tothe bucket shell 10. g Mounted on bails 14axially of the bucket is a drive'hub 16 having an integral flange 18through which pass bolts 20 securing it to the bails.

' Passing vertically through the bore of hub ,16 is the hollow drivespindle 22. The portion of the spindle within hub 16 is cylindrical andfree to rotate through a limited angle. with relation to hub 16, aswillbe explained. I The upper portion of spindle 22 is provided with asquare socket 24 into'whieh is secured, by keys '28, the lower end ortherotatable drive shaft30..

The weight of spindle 22'and its attachments is supported on the topofhub 16 through flange 32 of the spindle resting on flange 34 of thehub.

Flange 34 of the hub has two diametrically opposed forward-drive ears36, and two reversedrive ears 38. Flange 32 of thespindle has two 00'diametrically opposed drive lugs 40, each .projecting downwardly intothe space between an ear 36 and an car 38 of the hub, as may best beseen in Figs. 2 and 3. It will be apparent that spindle "22 may rotaterelatively to: hub 16 through an angle represented by line 42, and thatwhen lugs are against'ears 36 (Fig. 3) the spindle is in position torotate hub 16 and bucket 10 clockwise, which is the operative directionof rotation. If the a direction of rotation of the spindle be reversed,T0 lugs 40 will rotate through angle 42 from the position of Fig. 3 tothe position of Fig. 2, in which lugs 40. are against cars 38. Furtherrotation of the spindle in that reverse direction will cause hub 16 andthe bucket to rotate to the left (counter-clockwise) p Y Keyed tospindle 22 below hub 16 is a "collar 44 having a pair of diametricallyopposed arms 46, the outer ends ofwhich are connected by links 48to'crank arms 50, the hubs of which are keyed to the lower end ofvertical spindle, 56 (Fig. 6) supported for rotation by bails 14 andbearing? blocks 54 and 55 welded to the under and upper sides of thebails. The upper end of each spindle 56, above bail 14, is shaped toform a support 58 for a reamerblade 60, adjustable lengthwise rela:tively to the support on a guideway 62 forming part of the support.

Bolt 64 and nut 66 adjusted position.

The relationship of arms 46, links 48, arms 50, blades 60, andotherparts oi the apparatus is such that whenever lugs 40 of drivespindle 22 are against ears 38, as in Fig. 2, spindles 56 have beenrotated to retract reamer blades 60 until no parts of the blades projectbeyond the bucket. On the other hand, whenever spindle 22 is rotated toplace lugs '40 against-ears 36,-spindles 56 are rotated to move thereamer blades outwardly to their operative positions as in Fig. 3.Further rorill serve to hold the blade in tation of spindle 22 in thedirection of the arrow will cause the reamer blades to enlarge the holedug by the bucket, the diameter of the hole depending on the adjustedposition of blades 60 relatively to support 58.

The torque reaction of the blades is taken by stop plates 68 projectingabove the bucket shell and welded thereto, the reaction reaching plates68 through stop-lugs '70 forming a part of suports 58. 110

From the above it will be apparent that the reamer blades areautomatically forced outwardly to their operative positions whenever thebucket is rotated clockwise against any resistance sufiicient to bringdrive lugs 40 against ears 36; that the effective diameter of the reameris predetermined by the adjustment of the blades in supports 58; andthat the reamer blades are retracted whenever drive spindle 22 rotatescounter-clock wise relatively to the bucket, complete reaction beingattained when lugs 40 reach ears 38.

If desired, the reamer blades may be formed with upturned outer ends asshown at '72 (Fig. 1) so as to aid in scooping the detritus into thebucket.

It is to be understood that the invention is not limited to the specificembodiment herein illustrated and described, but may be used in otherways without departure from its spirit as defined by the followingclaims.

I claim: l v

1. In apparatus of the class described, in combination, a rotary diggingbucket for boring a hole in the earth, a hole-enlarging reamercomprising blades mounted at the upper end of said bucket for swingingmovement on vertical axes, and bucket rotating means for shifting thereamer blades from inoperative to operative reaming position while thebucket isin the hole in the ground.

2. In apparatus of the class described, in combination, a rotary diggingbucket for boring a hole in the earth, a hole-enlarging reamercomprising blades mounted at the upper end of said bucket for swingingmovement on vertical axes, means rotatable for rotating said bucket inthe hole, and means interconnecting said rotatable means and said bladeswhereby said rotatable means may be actuated to move said bladesabouttheir pivots on said bucket while the bucket is in the hole in theground. 1

3. In apparatus of the class described, in combination, a rotary diggingbucket for boring a hole in the earth, a hole-enlarging reamercomprising blades mounted at the upper end of said bucket for swingingmovement-on vertical .axes, means rotatable for rotating said bucket inthe hole and links connecting said rotatable means and said bladeswhereby said rotatable means may be actuated to move said blades abouttheir pivots on said bucket while the bucket is in the hole in theground.

4. In apparatus of the class described, in combination, a rotary diggingbucket for boring a hole inthe earth, a hole-enlarging reamer comprisingbladesmounted at the upper end of said bucket for swinging movement onvertical axes, a rotatable shaft for rotating said bucket in'the holeand adapted for limited angularrotation relatively to said bucket, andmeans interconnecting said shaft and said blades whereby saidshaftserves to swing said blades about their pivots when said shaft isrotated relatively to said bucket.

5. In apparatus of the class described, in combination, a rotary diggingbucket for boring a hole in the earth, a member mounted at the upper endof said'bucket forrotary movement on a vertical axis, a reamer bladesupported by said member and adjustable cross the axis of said member,means rotatable for rotating said bucket in the hole, and meansinterconnecting said rotatable means and said member, whereby said rotatable means may be actuated to move said member about its pivot forswinging said reamer blade from inoperative to operative position.

6. In apparatus of the class described, in combination, a rotary diggingbucket for boring a hole in the earth, a member mounted at the upper endof said bucket for rotary movement on a vertical axis, a reamer bladesupported by said member and adjustable across the axis of said member,a rotatable shaft for rotating said bucket in the hole and having alimited angular movement relatively thereto, a crank arm on said shaft,a crank arm on said member and a link interconnecting said arms wherebysaid shaft when moved angularly relatively to the bucket serves to shiftthe blade from inoperative to operative position.

7. In apparatus of the class described, in com bination, a rotarydigging bucket for boring a hole in the ground, reamer blades pivotallymounted on said bucket, and means operating to first move the blades totheir operating radius and then rotate the bucket in the hole.

8. In apparatus ofthe class described, in combinaton, a rotary diggingbucket having cutters at its lower end arranged to cut and throw detriusupwardly into the bucket, hole reaming blades projecting laterally fromthe upper end of the bucket and arranged to cut and throw detritus intothe upper end of the bucket, and means operating to throw the blades tooperative position and then rotate the bucket, togetherwith means foradjusting the operating radius of the blades.

9. Apparatus of the class described, comprising in combination, a rotarydigging bucket for boring a hole in the'ground, a cutter associated withsaid bucket, means rotatable for rotating said bucket, and meansinterconnecting said rotatable means, said bucket, and said cutterwhereby said rotatable means may be moved relative to said bucket forthe purpose of expanding or retracting said. cutter.

10, Apparatus of the class described, comprising in combination, arotary digging bucket, a cutter associated with said bucket, an axialshaft for rotating said bucket, and a lost-motion device interconnectingsaid shaft, said bucket and said cutter whereby said shaft may rotaterelative to said bucket for the purpose of expanding or retracting saidcutter.

11. In combination, a rotary bucket for boring a hole in the ground,means rotatable for rotating said bucket, a cutter associated with saidbucket and said rotatable means, said rotatable means being operativewhile the bucket is in the hole in the ground for moving the cutter toits operating radius, and meansselectively set by the operator beforethe bucket is lowered into the hole for determining the operating radiusof the cutter. v j

12. In combination, a rotary bucket for boring a hole in the ground,means rotatable for rotating said bucket in said'hole, a cuttervoperatively supported by said bucket and operatively connected to saidrotatable means, said rotatable means being effective to expand orretract said cutter at the will of the operator while said bucket is insaid hole, and means for predetermining the operating radius of saidcutter.

13.1 Apparatus of the class described, comprising inv combination, a.rotating digging bucket for boring a hole in the ground, a cutter associated with said bucket, means rotatable' for'ro-r tating said bucket andsaid cutter in either di-.- rection, means operated by said rotatablemeans whereby the initial movement of said rotatable means in eitherdirection is effective to move said cutter either outwardly or inwardlyrelative to said bucket.

14. Apparatus of the class described, comprising in combination, arotating digging bucket for boring a. hole in the ground, a cutterassociated with said bucket, means rotatable for rotating said bucketand said cutter in either direction, means operated by said rotatablemeans whereby the initial'mOVement of said rotatable means in eitherdirection is efiective to move said cutter either outwardly or inwardlyrelative to said bucket and means settable by the operator before thebucket is lowered into the hole for limiting the said movement of saidcutter.

15. Apparatus of the class described, comprising in combination, arotatable digging, bucket for boring a hole in the ground, a cutterassociated with said bucket, means rotatable for rotating said bucketand said cutter, and means operable by said rotatable means whereby aninitial movement of said rotatable means is eiIec tive to move saidcutter either outwardly or inwardly relative to said bucket.

16. Apparatus of the class described, comprising in combination, arotatable digging bucket for boring a hole in the ground, a cutterassociated with said bucket, means rotatable for rotating said bucketand said cutter, and means operable by said rotatable means whereby aninitial movement of said rotatable means in different directions isefiective to move said cutter either outwardly or inwardly relative tosaid bucket, and further rotation of said rotatable means in the samedirection is effective to rotate said bucket without moving said cutterrelative thereto.

1'7. Apparatus of the class described, comprising in combination, arotatable digging bucket for boring a hole in the ground, a cutterassociated with said bucket, means rotatable for rotating said bucketand said cutter, means interconnecting said rotatable means and saidbucket whereby said rotatable means may move relative to said bucket,and means interconnecting said cutter and said rotatable means wherebysaid movement of said rotatable means relative to said bucket serves tomove said cutter relative to said bucket.

FREDERICK A. SCHROEDER.

